Download Ranking of Database Query Results

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IDF Similarity, formal definition
For every value ‘t’ in the domain of attribute ‘A’,
IDF(t) can be defined as log(n/F(t)),
where ‘n’ = number of tuples in the database
F(t) = frequency of tuples in database where ‘A’ = ‘t’
The similarity between a tuple ‘T’ and a query ‘Q’ is
defined as:
SIM (T , Q)   S k (t k , q )
k 1
i.e., similarity between a tuple T and a query Q is
simply the sum of corresponding similarity
coefficients over all attributes in T